package com.sky.service.impl;

import com.github.pagehelper.Constant;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishOverViewVO;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.annotations.Select;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

//实现类必须要写的
@Service
//文档的注解
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和对应口味数据
     * @param dishDTO
     */
    //事务管理，保证原子性（因为操作两张表）
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //向菜品表插入菜品
        dishMapper.insert(dish);
        //获取insert语句生成的主键值，用于插入到口味表中
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size()>0) {//如果有口味数据,向口味表插入n条数据
            //先遍历数据，给dishId赋值，再插入数据
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);

        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        //里边属性不完全一样，前端还要一个分类名，dish里没有
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    //保证事务一致性
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否启售
        for (Long id : ids) {
           Dish dish =  dishMapper.getById(id);
           if(dish.getStatus()== StatusConstant.ENABLE) {//在售状态，不能删除
               throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
           }

        }
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds!=null && setmealIds.size()>0) { //判断是否被套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            dishFlavorMapper.deleteByDishId(id);   //删除关联的口味数据
//        }
        //优化：根据菜品id集合批量删除（不然查数据库次数过多，性能下降）
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查菜品数据
        Dish dish = dishMapper.getById(id);
        //根据id查口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将数据封装到VO中
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        //口味数据也加上
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品和口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品信息
        dishMapper.update(dish);
        //删除口味信息
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //再重新插入口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size()>0) {//如果有口味数据,向口味表插入n条数据
            //先遍历数据，给dishId赋值，再插入数据
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().status(status).id(id).build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     *
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    //根据菜品状态查询数量
    @Override
    public DishOverViewVO getOoverviewDishes() {
        Integer sold = dishMapper.getCountByStatus(StatusConstant.ENABLE);
        Integer discontinued = dishMapper.getCountByStatus(StatusConstant.DISABLE);
        return DishOverViewVO.builder().sold(sold).discontinued(discontinued).build();
    }
}
